The invasion of East Timor and, potentially, the Indonesian archipelago by cane toads from Australia demands a huge urgent eradication plan from the Rudd government, Australian Greens Leader Bob Brown said today.

"This is an international biological emergency which threatens huge extinction potential across the archipelago. It could also cost billions of dollars in economic loss for both East Timor and Indonesia, and, potentially, the rest of South East Asia," Senator Brown said.

"Urgent action to eradicate the pest before the coming wet season must be given priority," Senator Brown said.